I made a water cannon for the 7 ft. sub, which I call water cannon version 1.0. I took it out to my test pond to see if it was functional enough for further development. I think it is so I'll be working on version 2.0. The video clip is pretty short because I was more interested in testing than recording, but there is enough video for you to get an idea of how it worked.http://home.comcast.net/~tyourk/7ftwc1.mpg